CVE-2021-39521 Explained : Impact and Mitigation

This CVE article provides details about a vulnerability in libredwg through v0.10.1.3751 that can lead to a Denial of Service attack.

Understanding CVE-2021-39521

This section delves into the nature and consequences of the vulnerability.

What is CVE-2021-39521?

The vulnerability exists in libredwg up to version v0.10.1.3751 due to a NULL pointer dereference in the bit_read_BB() function in bits.c. This issue allows an attacker to trigger a Denial of Service attack.

The Impact of CVE-2021-39521

The vulnerability permits malicious actors to exploit the application and cause a Denial of Service, disrupting the normal operation of the software.

Technical Details of CVE-2021-39521

This section provides more technical insights into the vulnerability.

Vulnerability Description

A NULL pointer dereference is present in the bit_read_BB() function in bits.c in libredwg up to v0.10.1.3751, enabling a Denial of Service attack.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions: Up to v0.10.1.3751

Exploitation Mechanism

The vulnerability allows attackers to craft specific inputs to trigger the NULL pointer dereference and cause a Denial of Service.

Mitigation and Prevention

Learn about the steps to mitigate and prevent exploitation of CVE-2021-39521.

Immediate Steps to Take

Update libredwg to the latest version to patch the vulnerability.
Monitor for any unusual system behavior that could indicate a DoS attack.

Long-Term Security Practices

Regularly update software and libraries to address security flaws.
Implement network-level security measures to detect and prevent DoS attacks.

Patching and Updates

Ensure timely patching and updates for libredwg to mitigate the vulnerability.